@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');

:root {
  --bg: #060612;
  --bg-1: #0d0d1e;
  --bg-2: #12122a;
  --bg-3: #181834;
  --surface: rgba(18,18,42,0.85);
  --surface-2: rgba(24,24,52,0.92);
  --glass: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --glass-border-hover: rgba(255,255,255,0.18);
  --accent: #7c3aed;
  --accent-2: #06b6d4;
  --accent-3: #f59e0b;
  --accent-4: #10b981;
  --accent-5: #f43f5e;
  --accent-glow: rgba(124,58,237,0.4);
  --text: #f0f0ff;
  --text-2: #a0a0c0;
  --text-3: #606080;
  --text-4: #303050;
  --key-num: rgba(20,20,48,0.9);
  --key-fn: rgba(30,20,60,0.9);
  --key-op: rgba(60,30,120,0.8);
  --key-op-h: rgba(100,50,200,0.9);
  --key-eq-1: #7c3aed;
  --key-eq-2: #a855f7;
  --danger: #f43f5e;
  --success: #10b981;
  --warning: #f59e0b;
  --sidebar-w: 260px;
  --topbar-h: 56px;
  --r: 16px;
  --r-sm: 10px;
  --r-lg: 20px;
  --shadow: 0 24px 80px rgba(0,0,0,0.6);
  --shadow-sm: 0 8px 32px rgba(0,0,0,0.4);
  --glow: 0 0 40px rgba(124,58,237,0.2);
  --font: 'Outfit', sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --brand-grad: linear-gradient(90deg, #818cf8 0%, #a855f7 40%, #ec4899 80%, #f43f5e 100%);
}

[data-theme="light"] {
  --bg: #f4f4ff;
  --bg-1: #eaeaf8;
  --bg-2: #e0e0f4;
  --bg-3: #d8d8f0;
  --surface: rgba(240,240,255,0.92);
  --surface-2: rgba(255,255,255,0.97);
  --glass: rgba(255,255,255,0.72);
  --glass-border: rgba(0,0,0,0.07);
  --glass-border-hover: rgba(0,0,0,0.15);
  --text: #1a1a3e;
  --text-2: #4a4a6a;
  --text-3: #8a8aaa;
  --text-4: #c0c0d8;
  --key-num: rgba(240,240,255,0.95);
  --key-fn: rgba(228,228,248,0.9);
  --key-op: rgba(200,185,240,0.8);
  --key-op-h: rgba(180,150,230,0.9);
  --shadow: 0 8px 40px rgba(100,80,200,0.15);
  --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
  --glow: 0 0 30px rgba(124,58,237,0.1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
  -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }

#aurora-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.6; }

#cursor-glow {
  position: fixed; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(124,58,237,0.06) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none; z-index: 1;
  transform: translate(-50%, -50%); transition: opacity 0.3s;
}

.app-shell { position: relative; z-index: 2; display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-right: 1px solid var(--glass-border);
  display: flex; flex-direction: column;
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 200;
  transition: transform 0.35s var(--ease), box-shadow 0.35s;
  overflow-y: auto; overflow-x: hidden;
  padding-bottom: env(safe-area-inset-bottom, 20px);
  scrollbar-width: none;
}
.sidebar::-webkit-scrollbar { display: none; }

.sidebar-brand {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 18px 18px;
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}

.brand-icon { flex-shrink: 0; filter: drop-shadow(0 4px 12px rgba(124,58,237,0.5)); }
.brand-text { display: flex; flex-direction: column; gap: 2px; }

.brand-name {
  font-size: 22px; font-weight: 800; letter-spacing: -0.5px;
  background: var(--brand-grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.brand-sub { font-size: 10.5px; color: var(--text-3); font-weight: 400; }

.nav-menu { flex: 1; padding: 10px 0; }

.nav-section-label {
  font-size: 10px; font-weight: 700; letter-spacing: 0.12em;
  padding: 14px 18px 6px;
  background: var(--brand-grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.nav-item {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 9px 18px; border: none;
  background: transparent; color: var(--text-2);
  font-family: var(--font); font-size: 13.5px; font-weight: 500;
  cursor: pointer; text-align: left;
  transition: all 0.2s var(--ease); position: relative;
  border-radius: 0;
}

.nav-item::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%) scaleY(0);
  width: 3px; height: 60%;
  background: var(--brand-grad);
  border-radius: 0 3px 3px 0; transition: transform 0.3s var(--spring);
}

.nav-item:hover { color: var(--text); background: var(--glass); }
.nav-item:hover .nav-icon-wrap { transform: scale(1.1); }
.nav-item.active { color: var(--text); background: linear-gradient(90deg, rgba(124,58,237,0.14), transparent); }
.nav-item.active::before { transform: translateY(-50%) scaleY(1); }
.nav-item.active .nav-icon-wrap { background: linear-gradient(135deg, rgba(124,58,237,0.3), rgba(168,85,247,0.2)); color: #a855f7; }

.nav-icon-wrap {
  width: 30px; height: 30px; display: flex; align-items: center; justify-content: center;
  background: var(--glass); border-radius: 8px; font-size: 13px;
  transition: transform 0.2s var(--spring), background 0.2s, color 0.2s;
  flex-shrink: 0;
}

.nav-badge {
  margin-left: auto; font-size: 9px; font-weight: 700; letter-spacing: 0.08em;
  padding: 2px 6px; border-radius: 4px;
  background: var(--glass); color: var(--text-3);
}
.nav-badge-pro { background: linear-gradient(135deg, #7c3aed, #a855f7); color: white; }
.nav-badge-new { background: linear-gradient(135deg, #059669, #10b981); color: white; }

.sidebar-divider { height: 1px; background: var(--glass-border); margin: 8px 18px; }

.sidebar-settings { padding: 6px 0; }

.settings-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 18px; gap: 8px;
}

.settings-label { font-size: 12.5px; color: var(--text-2); display: flex; align-items: center; gap: 8px; }
.settings-label i { color: var(--accent); font-size: 12px; }

.settings-select {
  background: var(--glass); border: 1px solid var(--glass-border);
  color: var(--text); font-family: var(--font); font-size: 12px;
  padding: 4px 8px; border-radius: 8px; cursor: pointer; outline: none;
  max-width: 130px; transition: border-color 0.2s;
}
.settings-select:focus { border-color: var(--accent); }
.settings-select option { background: var(--bg-1); }

.theme-toggle-btn {
  width: 44px; height: 24px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 12px; cursor: pointer; position: relative; transition: all 0.3s; flex-shrink: 0;
}
.theme-toggle-btn.active { background: linear-gradient(90deg, var(--accent), var(--accent-2)); border-color: transparent; }

.theme-thumb {
  position: absolute; width: 18px; height: 18px; background: white; border-radius: 50%;
  top: 2px; left: 2px; transition: transform 0.3s var(--spring); box-shadow: var(--shadow-sm);
}
.theme-toggle-btn.active .theme-thumb { transform: translateX(20px); }

.history-open-btn {
  width: 32px; height: 32px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 8px; cursor: pointer; color: var(--text-2); font-size: 13px;
  display: flex; align-items: center; justify-content: center; transition: all 0.2s;
}
.history-open-btn:hover { background: var(--accent); color: white; border-color: transparent; }

.sidebar-footer { padding: 10px 18px 8px; }

.dev-card {
  display: flex; align-items: center; gap: 10px;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 12px; padding: 10px 12px;
}

.dev-avatar {
  width: 34px; height: 34px; border-radius: 9px; flex-shrink: 0;
  background: var(--brand-grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800; color: white;
}

.dev-info { flex: 1; min-width: 0; }
.dev-name { font-size: 12px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dev-links { display: flex; gap: 6px; margin-top: 4px; }

.dev-link {
  width: 24px; height: 24px; border-radius: 6px; display: flex; align-items: center;
  justify-content: center; font-size: 11px; text-decoration: none; transition: transform 0.2s;
}
.dev-link:hover { transform: scale(1.15); }
.dev-wa { background: #25D366; color: white; }
.dev-ig { background: linear-gradient(135deg, #E1306C, #833AB4); color: white; }
.dev-mail { background: #ea4335; color: white; }

.sidebar-overlay {
  position: fixed; inset: 0; z-index: 190; background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px); opacity: 0; pointer-events: none;
  transition: opacity 0.3s; display: none;
}
.sidebar-overlay.show { opacity: 1; pointer-events: all; display: block; }

.main-wrap {
  flex: 1; display: flex; flex-direction: column;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  transition: margin-left 0.35s var(--ease);
}

.topbar {
  height: var(--topbar-h);
  background: var(--surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--glass-border);
  display: none;
  align-items: center; gap: 10px;
  padding: 0 16px;
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
  position: sticky; top: 0; z-index: 100;
}

.topbar-menu {
  width: 36px; height: 36px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 10px; cursor: pointer; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px;
}
.topbar-menu span {
  width: 16px; height: 1.5px; background: var(--text-2); border-radius: 2px; transition: all 0.3s;
}

.topbar-title {
  flex: 1; font-size: 15px; font-weight: 700;
  background: var(--brand-grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.topbar-actions { display: flex; gap: 6px; }

.topbar-action {
  width: 36px; height: 36px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 10px; cursor: pointer; color: var(--text-2); font-size: 14px;
  display: flex; align-items: center; justify-content: center; transition: all 0.2s;
}
.topbar-action:hover { background: var(--accent); color: white; border-color: transparent; }

.main-content {
  flex: 1; padding: 24px;
  padding-bottom: max(24px, env(safe-area-inset-bottom));
}

.tab-panel { display: none; animation: fadeUp 0.35s var(--ease); }
.tab-panel.active { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.calc-container {
  max-width: 420px; margin: 0 auto;
  background: var(--surface-2);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,0.06);
}

.calc-display-wrap {
  background: linear-gradient(160deg, rgba(124,58,237,0.1), rgba(6,182,212,0.05));
  padding: 24px 24px 18px;
  position: relative; overflow: hidden;
}

.calc-display-wrap::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 80% 20%, rgba(124,58,237,0.12), transparent 60%);
  pointer-events: none;
}

.display-expr {
  font-family: var(--mono); font-size: 13px; font-weight: 400;
  color: var(--text-3); text-align: right; min-height: 18px;
  margin-bottom: 4px; letter-spacing: -0.02em;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.display-main {
  font-family: var(--mono); font-size: 48px; font-weight: 600;
  color: var(--text); text-align: right; line-height: 1.1;
  letter-spacing: -2px; transition: all 0.15s var(--ease);
  min-height: 54px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  cursor: default; user-select: all;
}

.display-main.pop { animation: popAnim 0.2s var(--spring); }

@keyframes popAnim {
  0% { transform: scale(1); }
  50% { transform: scale(1.04); }
  100% { transform: scale(1); }
}

.display-meta {
  display: flex; align-items: center; justify-content: space-between; margin-top: 8px;
}

.mem-indicator {
  font-size: 11px; font-weight: 700; color: var(--accent-2);
  background: rgba(6,182,212,0.15); padding: 2px 8px; border-radius: 4px; letter-spacing: 0.05em;
}

.display-hint { font-size: 12px; color: var(--text-3); font-family: var(--mono); }

.angle-btns { display: flex; gap: 4px; }

.angle-btn {
  font-size: 10px; font-weight: 700; padding: 3px 8px; border-radius: 6px;
  border: 1px solid var(--glass-border); background: var(--glass); color: var(--text-3);
  cursor: pointer; transition: all 0.2s; font-family: var(--mono);
}
.angle-btn.active { background: var(--accent); border-color: transparent; color: white; }

.keypad-grid { display: grid; padding: 14px; gap: 9px; }
.keypad-std { grid-template-columns: repeat(4, 1fr); }
.keypad-sci { grid-template-columns: repeat(5, 1fr); }

.key {
  position: relative; overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: 12px; cursor: pointer;
  font-family: var(--font); font-size: 16px; font-weight: 600;
  height: 60px; transition: all 0.15s var(--ease);
  display: flex; align-items: center; justify-content: center;
  user-select: none; -webkit-tap-highlight-color: transparent;
  outline: none; letter-spacing: -0.02em;
}

.key-num {
  background: var(--key-num); color: var(--text);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 4px 12px rgba(0,0,0,0.3);
}
.key-num:hover {
  background: var(--key-fn); border-color: var(--glass-border-hover);
  transform: translateY(-2px); box-shadow: inset 0 1px 0 rgba(255,255,255,0.1), 0 8px 20px rgba(0,0,0,0.4);
}
.key-num:active { transform: translateY(0) scale(0.96); }

.key-fn {
  background: var(--key-fn); color: var(--text-2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 4px 12px rgba(0,0,0,0.3);
  font-size: 14px;
}
.key-fn:hover { background: rgba(60,40,100,0.9); color: var(--text); border-color: var(--glass-border-hover); transform: translateY(-2px); }
.key-fn:active { transform: translateY(0) scale(0.96); }

.key-op {
  background: var(--key-op); color: var(--accent-2);
  box-shadow: inset 0 1px 0 rgba(6,182,212,0.1), 0 4px 12px rgba(0,0,0,0.3);
}
.key-op:hover { background: var(--key-op-h); color: white; border-color: rgba(6,182,212,0.3); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(124,58,237,0.3); }
.key-op:active { transform: translateY(0) scale(0.96); }

.key-eq {
  background: linear-gradient(135deg, var(--key-eq-1), var(--key-eq-2));
  color: white; border-color: transparent;
  box-shadow: 0 8px 24px rgba(124,58,237,0.4), inset 0 1px 0 rgba(255,255,255,0.2);
}
.key-eq:hover { transform: translateY(-3px); box-shadow: 0 16px 40px rgba(124,58,237,0.5), inset 0 1px 0 rgba(255,255,255,0.3); filter: brightness(1.1); }
.key-eq:active { transform: translateY(0) scale(0.97); }

.key-2nd.active { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: white; border-color: transparent; }
.key-zero { grid-column: span 1; }

.ripple {
  position: absolute; border-radius: 50%; pointer-events: none;
  background: rgba(255,255,255,0.2);
  transform: scale(0); animation: rippleOut 0.5s linear forwards;
}
@keyframes rippleOut { to { transform: scale(4); opacity: 0; } }

.memory-strip { display: flex; gap: 6px; padding: 0 14px 14px; }

.mem-btn {
  flex: 1; height: 32px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 8px; color: var(--text-2); font-family: var(--mono); font-size: 11px;
  font-weight: 600; cursor: pointer; transition: all 0.2s; letter-spacing: 0.03em;
}
.mem-btn:hover { background: var(--accent); color: white; border-color: transparent; }
.mem-btn:active { transform: scale(0.95); }

.calc-sci-container { max-width: 560px; }
.keypad-sci .key { height: 50px; font-size: 13px; }

.content-card {
  max-width: 720px; margin: 0 auto;
  background: var(--surface-2);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,0.04);
}

.card-head {
  margin-bottom: 20px;
  display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}

.card-head h2 {
  font-size: 20px; font-weight: 800; letter-spacing: -0.5px;
  background: var(--brand-grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.card-sub { font-size: 12.5px; color: var(--text-3); margin-top: 3px; }

.rate-status-pill {
  display: flex; align-items: center; gap: 6px;
  background: var(--glass); border: 1px solid var(--glass-border);
  padding: 5px 10px; border-radius: 20px; font-size: 12px; font-weight: 600;
}

.rate-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--text-3); transition: background 0.3s; }
.rate-dot.live { background: var(--success); box-shadow: 0 0 8px var(--success); animation: pulse 2s infinite; }
.rate-dot.offline { background: var(--danger); }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.rate-info-bar {
  background: linear-gradient(90deg, rgba(16,185,129,0.1), transparent);
  border: 1px solid rgba(16,185,129,0.2); border-radius: 10px;
  padding: 9px 14px; font-size: 12px; color: var(--success);
  margin-bottom: 18px; min-height: 36px;
}

.converter-row {
  display: flex; align-items: flex-end; gap: 10px;
  flex-wrap: nowrap; margin-bottom: 18px;
}

.conv-field {
  flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px;
}

.conv-field label {
  font-size: 11px; font-weight: 700; color: var(--text-3);
  letter-spacing: 0.08em; text-transform: uppercase;
}

.conv-input, .conv-select {
  width: 100%; height: 46px; padding: 0 12px;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 12px; color: var(--text); font-family: var(--font); font-size: 14px;
  font-weight: 500; outline: none; transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none; appearance: none;
}
.conv-input:focus, .conv-select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,58,237,0.15); }
.conv-select option { background: var(--bg-1); }

.swap-circle-btn {
  width: 42px; height: 46px; border-radius: 12px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none; color: white; font-size: 15px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.4s var(--spring), box-shadow 0.2s;
  box-shadow: 0 6px 20px rgba(124,58,237,0.3);
  align-self: flex-end;
}
.swap-circle-btn:hover { transform: rotate(180deg); box-shadow: 0 12px 32px rgba(124,58,237,0.5); }

.result-hero {
  font-family: var(--mono); font-size: 32px; font-weight: 700;
  color: var(--text); text-align: center; padding: 20px;
  background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(6,182,212,0.05));
  border: 1px solid var(--glass-border); border-radius: var(--r);
  margin-bottom: 18px; letter-spacing: -0.5px;
  animation: fadeUp 0.3s var(--ease); transition: all 0.3s var(--ease);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.rate-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px;
}

.rate-chip {
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 12px; padding: 11px 12px;
  transition: transform 0.2s var(--spring), border-color 0.2s;
}
.rate-chip:hover { transform: translateY(-2px); border-color: var(--glass-border-hover); }
.rate-chip-label { font-size: 12px; font-weight: 700; color: var(--text-2); margin-bottom: 4px; }
.rate-chip-value { font-size: 12px; color: var(--text); font-family: var(--mono); font-weight: 500; }

.cat-scroll-wrap { overflow-x: auto; margin-bottom: 18px; padding-bottom: 4px; }
.cat-scroll-wrap::-webkit-scrollbar { height: 2px; }

.cat-pills { display: flex; gap: 7px; min-width: max-content; }

.cat-pill {
  padding: 7px 13px; border-radius: 20px; font-size: 12.5px; font-weight: 600;
  background: var(--glass); border: 1px solid var(--glass-border); color: var(--text-2);
  cursor: pointer; white-space: nowrap; transition: all 0.2s;
}
.cat-pill:hover { border-color: var(--glass-border-hover); color: var(--text); }
.cat-pill.active {
  background: var(--brand-grad);
  border-color: transparent; color: white;
  box-shadow: 0 4px 16px rgba(124,58,237,0.3);
}

.formula-badge {
  display: inline-block; background: rgba(124,58,237,0.1); border: 1px solid rgba(124,58,237,0.2);
  border-radius: 8px; padding: 5px 12px; font-size: 11.5px; color: var(--accent-2);
  font-family: var(--mono); margin-bottom: 14px;
}

.unit-table-head {
  font-size: 11px; font-weight: 700; color: var(--text-3);
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 10px;
}

.unit-chips-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 8px;
}

.unit-chip {
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 10px; padding: 9px 12px; transition: all 0.2s;
}
.unit-chip:hover { border-color: var(--glass-border-hover); transform: translateY(-1px); }
.unit-chip-from { font-size: 11px; color: var(--text-3); margin-bottom: 2px; }
.unit-chip-to { font-size: 12.5px; color: var(--text); font-family: var(--mono); font-weight: 500; }

.fin-tab-scroll { overflow-x: auto; margin-bottom: 18px; padding-bottom: 4px; }
.fin-tab-scroll::-webkit-scrollbar { height: 2px; }
.fin-tabs { display: flex; gap: 7px; min-width: max-content; }

.fin-tab {
  display: flex; align-items: center; gap: 5px;
  padding: 7px 13px; border-radius: 10px; font-size: 12.5px; font-weight: 600;
  background: var(--glass); border: 1px solid var(--glass-border); color: var(--text-2);
  cursor: pointer; white-space: nowrap; transition: all 0.2s; font-family: var(--font);
}
.fin-tab:hover { color: var(--text); border-color: var(--glass-border-hover); }
.fin-tab.active {
  background: var(--brand-grad);
  border-color: transparent; color: white;
  box-shadow: 0 4px 16px rgba(124,58,237,0.25);
}
.fin-tab.active i { color: white; }

.fin-panel { display: none; }
.fin-panel.active { display: block; animation: fadeUp 0.3s var(--ease); }

.fin-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px; margin-bottom: 14px;
}

.fin-field { display: flex; flex-direction: column; gap: 6px; }

.fin-field label {
  font-size: 10.5px; font-weight: 700; color: var(--text-3);
  letter-spacing: 0.06em; text-transform: uppercase;
}

.fin-field input, .fin-field select {
  width: 100%; height: 44px; padding: 0 12px;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 10px; color: var(--text); font-family: var(--font); font-size: 14px;
  outline: none; transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none; appearance: none;
}
.fin-field input:focus, .fin-field select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,58,237,0.12); }
.fin-field select option { background: var(--bg-1); }

.action-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 12px;
  background: var(--brand-grad);
  border: none; color: white; font-family: var(--font); font-size: 14px; font-weight: 700;
  cursor: pointer; transition: all 0.2s var(--spring); margin-bottom: 14px;
  box-shadow: 0 6px 20px rgba(124,58,237,0.3);
}
.action-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(124,58,237,0.4); filter: brightness(1.06); }
.action-btn:active { transform: scale(0.97); }

.zakat-btn {
  background: linear-gradient(135deg, var(--accent-3), #f97316);
  box-shadow: 0 6px 20px rgba(245,158,11,0.3);
}
.zakat-btn:hover { box-shadow: 0 14px 36px rgba(245,158,11,0.4); }

.fin-result-box {
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--r); padding: 14px; display: none; animation: fadeUp 0.3s var(--ease);
}
.fin-result-box.show { display: block; }

.fin-result-row {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 7px 0; border-bottom: 1px solid var(--glass-border); gap: 10px;
}
.fin-result-row:last-child { border-bottom: none; }

.fin-result-label { font-size: 12.5px; color: var(--text-2); flex: 1; min-width: 0; line-height: 1.4; }
.fin-result-value { font-size: 13px; font-weight: 700; color: var(--text); font-family: var(--mono); text-align: right; flex-shrink: 0; max-width: 55%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fin-result-value.highlight { color: var(--accent-2); }
.fin-result-value.danger { color: var(--danger); }

.prog-display-area {
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--r); padding: 14px; margin-bottom: 14px;
}

.prog-bases { display: flex; flex-direction: column; gap: 7px; margin-bottom: 12px; }

.prog-base-row {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 10px; border: 1px solid transparent; transition: all 0.2s;
}
.prog-base-row.active { background: rgba(124,58,237,0.1); border-color: rgba(124,58,237,0.2); }

.pb-label { font-size: 11px; font-weight: 800; color: var(--text-3); letter-spacing: 0.08em; width: 34px; flex-shrink: 0; font-family: var(--mono); }
.pb-value { flex: 1; font-family: var(--mono); font-size: 15px; font-weight: 600; color: var(--text); letter-spacing: 0.04em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.pb-input {
  flex: 1; background: none; border: none; outline: none; font-family: var(--mono);
  font-size: 18px; font-weight: 700; color: var(--text); letter-spacing: 0.04em;
  min-width: 0; caret-color: var(--accent);
}

.pb-copy { background: none; border: none; color: var(--text-3); cursor: pointer; font-size: 12px; padding: 4px; border-radius: 6px; transition: all 0.2s; }
.pb-copy:hover { color: var(--accent); background: rgba(124,58,237,0.1); }

.bit-visualizer { display: flex; flex-wrap: wrap; gap: 3px; justify-content: flex-end; }

.bit-cell {
  width: 20px; height: 20px; border-radius: 5px; display: flex; align-items: center;
  justify-content: center; font-family: var(--mono); font-size: 9px; font-weight: 700;
  transition: all 0.2s var(--spring); cursor: pointer;
}
.bit-cell.one { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: white; box-shadow: 0 2px 8px rgba(124,58,237,0.4); }
.bit-cell.zero { background: var(--glass); border: 1px solid var(--glass-border); color: var(--text-3); }
.bit-cell.separator { background: none; color: var(--text-4); font-size: 8px; }

.prog-ops-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; margin-bottom: 10px; }

.prog-op-btn {
  padding: 9px; border-radius: 10px; font-family: var(--mono); font-size: 12.5px; font-weight: 700;
  background: var(--glass); border: 1px solid var(--glass-border); color: var(--accent-2);
  cursor: pointer; transition: all 0.2s;
}
.prog-op-btn:hover { background: rgba(6,182,212,0.15); border-color: rgba(6,182,212,0.3); transform: translateY(-1px); }
.prog-op-btn:active { transform: scale(0.96); }

.prog-keypad { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.prog-keypad .key { height: 46px; font-size: 13px; }
.prog-hex-key { color: var(--accent-3); }
.prog-hex-key:disabled { opacity: 0.3; cursor: not-allowed; }
.prog-zero-key { grid-column: span 2; }

.zakat-head { gap: 14px; }
.zakat-ornament { filter: drop-shadow(0 4px 12px rgba(245,158,11,0.5)); flex-shrink: 0; }

.zakat-info-box {
  display: flex; align-items: flex-start; gap: 10px;
  background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.2);
  border-radius: 10px; padding: 11px 14px; margin-bottom: 14px;
  font-size: 12.5px; color: var(--text-2); line-height: 1.5;
}
.zakat-info-box i { color: var(--accent-3); flex-shrink: 0; margin-top: 2px; }

.zakat-tabs { display: flex; gap: 7px; margin-bottom: 18px; flex-wrap: wrap; }

.zakat-tab {
  padding: 7px 14px; border-radius: 10px; font-size: 12.5px; font-weight: 600;
  background: var(--glass); border: 1px solid var(--glass-border); color: var(--text-2);
  cursor: pointer; transition: all 0.2s; font-family: var(--font);
}
.zakat-tab:hover { color: var(--text); }
.zakat-tab.active {
  background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(249,115,22,0.15));
  border-color: rgba(245,158,11,0.4); color: var(--accent-3);
}

.zakat-panel { display: none; }
.zakat-panel.active { display: block; animation: fadeUp 0.3s var(--ease); }

.history-panel {
  position: fixed; right: 0; top: 0; bottom: 0; width: 320px;
  background: var(--surface); backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--glass-border);
  z-index: 300; display: flex; flex-direction: column;
  transform: translateX(100%); transition: transform 0.35s var(--ease);
  box-shadow: -20px 0 60px rgba(0,0,0,0.4);
}
.history-panel.open { transform: translateX(0); }

.history-backdrop {
  position: fixed; inset: 0; z-index: 299; background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px); opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.history-backdrop.show { opacity: 1; pointer-events: all; }

.history-panel-head {
  display: flex; align-items: center; gap: 8px; padding: 18px 18px 14px;
  border-bottom: 1px solid var(--glass-border);
}
.history-panel-head h3 { font-size: 15px; font-weight: 800; flex: 1; }

.history-clear-btn {
  font-size: 12px; color: var(--danger); background: none; border: none; cursor: pointer;
  font-family: var(--font); font-weight: 600; padding: 4px 8px; border-radius: 6px; transition: background 0.2s;
}
.history-clear-btn:hover { background: rgba(244,63,94,0.1); }

.history-close-btn {
  width: 30px; height: 30px; background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 8px; cursor: pointer; color: var(--text-2); display: flex;
  align-items: center; justify-content: center; font-size: 13px; transition: all 0.2s;
}
.history-close-btn:hover { background: var(--danger); color: white; border-color: transparent; }

.history-list { flex: 1; overflow-y: auto; padding: 10px; }

.history-empty { text-align: center; color: var(--text-3); font-size: 13px; padding: 40px 20px; }

.history-item {
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: 10px; padding: 11px 13px; margin-bottom: 7px;
  cursor: pointer; transition: all 0.2s; animation: fadeUp 0.2s var(--ease);
}
.history-item:hover { border-color: var(--glass-border-hover); transform: translateX(-2px); }
.history-item-expr { font-size: 11.5px; color: var(--text-3); font-family: var(--mono); margin-bottom: 3px; }
.history-item-result { font-size: 15px; font-weight: 700; color: var(--text); font-family: var(--mono); }
.history-item-time { font-size: 10px; color: var(--text-4); margin-top: 3px; }

.toast-container {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  z-index: 1000; display: flex; flex-direction: column; gap: 8px; align-items: center;
  pointer-events: none;
}

.toast {
  background: var(--surface-2); border: 1px solid var(--glass-border);
  backdrop-filter: blur(16px); border-radius: 24px; padding: 9px 18px;
  font-size: 13.5px; font-weight: 600; color: var(--text); white-space: nowrap;
  box-shadow: var(--shadow); animation: toastIn 0.3s var(--spring) forwards;
  pointer-events: none;
}
.toast.success { border-color: rgba(16,185,129,0.3); color: var(--success); }
.toast.error { border-color: rgba(244,63,94,0.3); color: var(--danger); }

@keyframes toastIn { from { opacity: 0; transform: translateY(20px) scale(0.8); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes toastOut { from { opacity: 1; transform: translateY(0) scale(1); } to { opacity: 0; transform: translateY(-10px) scale(0.9); } }

@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); box-shadow: none; }
  .sidebar.open { transform: translateX(0); box-shadow: 20px 0 80px rgba(0,0,0,0.6); }
  .main-wrap { margin-left: 0; }
  .topbar { display: flex; }
  .main-content { padding: 14px; }
  .calc-container { max-width: 100%; }
  .calc-sci-container { max-width: 100%; }
  .content-card { padding: 18px; }
  .display-main { font-size: 40px; }
}

@media (max-width: 600px) {
  .main-content { padding: 10px; padding-bottom: max(10px, env(safe-area-inset-bottom)); }

  .calc-container, .calc-sci-container { border-radius: 16px; }
  .calc-display-wrap { padding: 16px 16px 12px; }
  .display-main { font-size: 36px; letter-spacing: -1.5px; min-height: 44px; }
  .display-expr { font-size: 12px; }

  .keypad-grid { padding: 10px; gap: 7px; }
  .key { height: 54px; font-size: 15px; border-radius: 10px; }
  .key-fn { font-size: 12.5px; }
  .keypad-sci .key { height: 40px; font-size: 11px; border-radius: 9px; }
  .keypad-sci { gap: 5px; padding: 8px; }

  .memory-strip { padding: 0 10px 10px; gap: 5px; }
  .mem-btn { height: 28px; font-size: 10px; border-radius: 7px; }

  .content-card { padding: 14px; border-radius: 16px; }
  .card-head { margin-bottom: 16px; }
  .card-head h2 { font-size: 17px; }
  .card-sub { font-size: 11.5px; }

  .converter-row {
    display: grid;
    grid-template-columns: 1fr 42px 1fr;
    align-items: end;
    gap: 8px;
    flex-wrap: nowrap;
    margin-bottom: 14px;
  }
  .swap-circle-btn { width: 42px; height: 44px; font-size: 13px; align-self: end; }
  .conv-input, .conv-select { height: 44px; font-size: 13px; padding: 0 10px; }

  .result-hero { font-size: 22px; padding: 14px; }

  .rate-grid { grid-template-columns: repeat(2, 1fr); gap: 6px; }
  .rate-chip { padding: 9px 10px; border-radius: 10px; }
  .rate-chip-label { font-size: 11px; }
  .rate-chip-value { font-size: 11px; }

  .cat-pills { gap: 6px; }
  .cat-pill { padding: 6px 11px; font-size: 12px; }

  .fin-grid { grid-template-columns: 1fr; gap: 10px; }
  .fin-field input, .fin-field select { height: 42px; font-size: 14px; }
  .action-btn { padding: 10px 18px; font-size: 13px; width: 100%; justify-content: center; }

  .fin-tabs { gap: 6px; }
  .fin-tab { padding: 6px 10px; font-size: 11.5px; gap: 4px; }
  .fin-tab i { font-size: 11px; }
  .fin-result-value { max-width: 50%; font-size: 12px; }

  .zakat-tabs { gap: 6px; }
  .zakat-tab { padding: 6px 11px; font-size: 12px; }
  .zakat-info-box { font-size: 12px; padding: 10px 12px; }

  .prog-display-area { padding: 10px; }
  .prog-bases { gap: 5px; }
  .pb-label { font-size: 10px; width: 28px; }
  .pb-value { font-size: 13px; }
  .pb-input { font-size: 15px; }
  .bit-cell { width: 17px; height: 17px; font-size: 8px; }
  .bit-visualizer { gap: 2px; }
  .prog-ops-grid { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .prog-op-btn { padding: 8px; font-size: 11px; }
  .prog-keypad { gap: 5px; }
  .prog-keypad .key { height: 42px; font-size: 12.5px; }

  .unit-chips-grid { grid-template-columns: repeat(2, 1fr); gap: 6px; }
  .unit-chip { padding: 8px 10px; }
  .unit-chip-from { font-size: 10px; }
  .unit-chip-to { font-size: 11.5px; }

  .history-panel {
    width: 100%; right: 0; bottom: 0; top: auto; height: 72vh;
    transform: translateY(100%); border-radius: 18px 18px 0 0;
    border-left: none; border-top: 1px solid var(--glass-border);
  }
  .history-panel.open { transform: translateY(0); }
}

@media (max-width: 380px) {
  .main-content { padding: 8px; }
  .key { height: 48px; font-size: 14px; }
  .keypad-grid { gap: 5px; padding: 8px; }
  .keypad-sci .key { height: 36px; font-size: 10px; }
  .display-main { font-size: 30px; }
  .content-card { padding: 12px; }
  .rate-grid { grid-template-columns: 1fr 1fr; }
  .prog-keypad .key { height: 38px; }
}

[dir="rtl"] .sidebar { left: auto; right: 0; border-right: none; border-left: 1px solid var(--glass-border); }
[dir="rtl"] .main-wrap { margin-left: 0; margin-right: var(--sidebar-w); }
[dir="rtl"] .history-panel { left: 0; right: auto; border-left: none; border-right: 1px solid var(--glass-border); }
[dir="rtl"] .display-main, [dir="rtl"] .display-expr { text-align: left; }
[dir="rtl"] .nav-item::before { left: auto; right: 0; border-radius: 3px 0 0 3px; }
@media (max-width: 900px) {
  [dir="rtl"] .sidebar { transform: translateX(100%); }
  [dir="rtl"] .main-wrap { margin-right: 0; }
}